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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H3><A NAME="HDRDXVPBB"
HREF="progu097.htm#PToC_435">DXValidPositionsBoundaryBox</A></H3>
<A NAME="IDX2145"></A>
<A NAME="IDX2146"></A>
<P><STRONG>Function</STRONG>
<P>
Computes the boundary box of the valid positions of an Object
<TT><STRONG>o</STRONG></TT>.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
&#35;include &lt;dx/dx.h&gt;<BR>
<P><BR>
DXValidPositionsBoundaryBox(Object o, Point *box)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
If <TT><STRONG>o</STRONG></TT> contains any invalid positions, this routine
adds (to  <TT><STRONG>o</STRONG></TT> or to any of its descendents that
are Fields) a "valid box" component consisting of an Array
of 2<SUP><I>d</I></SUP> points that are the corners of
a boundary box (where <I>d</I> is the
dimensionality of the data).
<P>
<TT><STRONG>Point</STRONG></TT> is defined as follows:
<PRE><STRONG>
typedef struct point &#123;
    float x,y,z;
&#125; Point, Vector;
</STRONG>
</PRE>
<P><B>Notes: </B><OL>
<P><LI>For data of dimensionality three or less, the routine returns (in
the Array pointed to by <TT><STRONG>box</STRONG></TT>) the eight
corner points.
For dimensionalities less than three, the extra dimensions of the box
returned by the routine are treated as zero.
<P><LI>The boundary box returned by the routine is determined by combining
the boundary boxes of all Fields contained in
<TT><STRONG>o</STRONG></TT>.
<P><LI>Transformations are considered in computing the boundary box, but
clipping objects are not.
And the boundary box is not guaranteed to be the tightest possible.
</OL>
<P><STRONG>Return Value</STRONG>
<P>
Returns <TT><STRONG>o</STRONG></TT> or returns <TT><STRONG>NULL</STRONG></TT>
and
might or might not set an error code, depending on the input.
For example, it does not set an error code if a boundary box cannot be
defined for the given input.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu111.htm#HDRDXBB">DXBoundingBox</A>,
<A HREF="progu113.htm#HDRDXCCVS">DXChangedComponentValues,
DXChangedComponentStructure</A>,
<A HREF="progu135.htm#HDRDXEMF">DXEmptyField</A>,
<A HREF="progu136.htm#HDRDXENDF">DXEndField</A>,
<A HREF="progu137.htm#HDRDXEO">DXEndObject</A>,
<A HREF="progu243.htm#HDRDXN">DXNeighbors</A>,
<A HREF="progu331.htm#HDRDXS">DXStatistics</A>
</STRONG></TT>
<P>
<A HREF="progu055.htm#HDRERRSEC">13.1 , "Error Handling and Messages"</A>.
<P><P>
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